Eurycoma longifolia Jack, more commonly known as Tongkat Ali, Malaysian Ginseng, or Longjack, is used by herbalists throughout Southeast Asia. The root of the plant is especially sought after for its natural bioactive compounds including Eurypeptides and Saponins.* TestoJack 300™, by NOW®, delivers 300 mg of non-GMO Tongkat Ali extract in every vegcap.